SiC_w/MgLiAl复合材料的界面结构

来源期刊：中国有色金属学报2000年第1期

论文作者：马春江 张荻 覃继宁 吴人洁

文章页码：22 - 26

关键词：SiC_w/MgLiAl复合材料；界面结构；力学性能

Key words：SiC_w/MgLiAl composites; interfacial structure; mechanical properties

摘    要：从热力学角度分析了SiC晶须与Mg-Li-Al合金的化学相容性，利用透射电镜及高分辨电镜研究了SiC_w/MgLiAl复合材料的界面结构，并测试了复合材料的力学性能。结果表明，该复合体系化学相容性较好， SiC晶须与基体合金界面结合紧密，没有反应物；少数SiC 晶须表面发生了沿{111}晶面的定向损伤，出现了70.5°或109.5°台阶。拉伸实验结果表明，SiC晶须对Mg-Li-Al合金具有明显的强化作用，使复合材料的抗拉强度、弹性模量明显提高。

Abstract: The chemical compatibility, interfacial structure and tensile properties of SiC_w/MgLiAl composites were studied. The results showed that the thermodynamic potential for the reaction between the matrix and SiC whiskers is very low. There is a good connection between the Mg-Li-Al matrix and SiC whiskers. No compound was found on the interface of the composites. However, some whiskers were invaded in the direction {111}. As a result, stages with 70.5° or 109.5° angles were formed on the surface of SiC whiskers. Tensile test confirmed that the tensile strength of SiC_w/MgLi₈Al₁ composites was increased by nearly 50%, in compared with the matrix alloy.